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All Electrical Engineering MCQs

Study 3,658 Electrical Engineering MCQs with correct answers and explanations.

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1521Electrical EngineeringMedium

Which of the following power plants need the least period for installation?

ADiesel power plant

BNuclear power plant

CThermal power plant

DHydro-electric power plant

Correct answer

A. Diesel power plant

Explanation

The correct answer is Diesel power plant.

1522Electrical EngineeringMedium

The dielectric strength of transformer oil is expected to be________?

A330 kV

BlkV

C100 kV

D33 kV

Correct answer

D. 33 kV

Explanation

The correct answer is 33 kV.

1523Electrical EngineeringMedium

Due to non sinusoidal waveform of the input current, the power factor of the rectifier is________?

ANegatively affected by firing angle

BNegatively affected by distortion of the input current

CBoth (a) and (b)

DPositively affected by both firing angle and distortion of the input current

Correct answer

C. Both (a) and (b)

Explanation

The correct answer is Both (a) and (b).

1524Electrical EngineeringMedium

Which of the following motors is usually used in house-hold refrigerators?

ASynchronous motor

BD.C. shunt motor

CReluctance motor

DD.C. series motor

ESingle phase induction motor (split phase start or induction run motor)

Correct answer

E. Single phase induction motor (split phase start or induction run motor)

Explanation

The correct answer is Single phase induction motor (split phase start or induction run motor).

1525Electrical EngineeringMedium

Which of the following is the best method for determining the stability and transient response?

ABode plot

BNone of the above

CNyquist plot

DRoot locus

Correct answer

D. Root locus

Explanation

The correct answer is Root locus.

1526Electrical EngineeringMedium

Out of the following statements, concerning an electric field, which statement is not true?

AUnit field intensity in the exertion of a force of one newton on a charge of one coulomb

BThe electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

CThe electric intensity is a vector quantity

DAn electric field is defined as a point in space at which an electric charge would experience a force

Correct answer

B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

Explanation

The correct answer is The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point.

1527Electrical EngineeringMedium

In a transistor amplifier circuit VCE = VCB +________?

ANone of the above

BVBE

C2VBE

D5 VBE

Correct answer

B. VBE

Explanation

The correct answer is VBE.

1528Electrical EngineeringMedium

Which of these is the best description for a Zener diode?

AIt is a constant-voltage device

BIt is a diode

CIt works in the forward region

DIt is a constant current device

Correct answer

A. It is a constant-voltage device

Explanation

The correct answer is It is a constant-voltage device.

1529Electrical EngineeringMedium

The rotor copper losses, in a synchronous motor, are met by________?

Aarmature input

Bd.c. source

Cmotor input

Dsupply lines

Correct answer

B. d.c. source

Explanation

The correct answer is d.c. source.

1530Electrical EngineeringMedium

In all base driver amplifiers________?

Aac collector voltage is in phase with ac base voltage

Bac emitter voltage is 180° out of phase with ac base voltage

Cac collector voltage is 180° out of phase with ac base voltage

Dnone of the above

Correct answer

C. ac collector voltage is 180° out of phase with ac base voltage

Explanation

The correct answer is ac collector voltage is 180° out of phase with ac base voltage.

Which of the following motors is usually used in house-hold refrigerators?

ASynchronous motor

BD.C. shunt motor

CReluctance motor

DD.C. series motor

ESingle phase induction motor (split phase start or induction run motor)

Correct answer

E. Single phase induction motor (split phase start or induction run motor)

Explanation

The correct answer is Single phase induction motor (split phase start or induction run motor).

Out of the following statements, concerning an electric field, which statement is not true?

AUnit field intensity in the exertion of a force of one newton on a charge of one coulomb

BThe electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

CThe electric intensity is a vector quantity

DAn electric field is defined as a point in space at which an electric charge would experience a force

Correct answer

B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

Explanation

The correct answer is The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point.

In all base driver amplifiers________?

Aac collector voltage is in phase with ac base voltage

Bac emitter voltage is 180° out of phase with ac base voltage

Cac collector voltage is 180° out of phase with ac base voltage

Dnone of the above

Correct answer

C. ac collector voltage is 180° out of phase with ac base voltage

Explanation

The correct answer is ac collector voltage is 180° out of phase with ac base voltage.